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        <div class="a_plan">
            <div class="people">
               <b>A君</b>
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                <button class="btn" data-idcard="aplan2">发送</button>
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        <!-- b的聊天界面 -->
        <div class="b_plan">
                <div class="people">
                    <b>B君</b>
                </div>
                <div class="msg" id="aplan2">
                </div>
                <div class="send">
                    <input type="text" name="msg1">
                    <button class="btn" data-idcard="aplan1">发送</button>
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